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<TITLE>[Chapter 19] Button</TITLE>
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<DIV CLASS=refnamediv>
<H1>Button</H1>

<H2>Name</H2>

Button

</DIV>

<DIV CLASS=refsect1>
<h2 CLASS=refsect1><A CLASS="TITLE" NAME="ch19-REFSECT1-AUTOID.7"></A></h2>
</DIV>


<p>
<img align=middle src="./figs/button.gif" alt="[Graphic: Figure from the text]" width=502 height=53 border=0>

</DIV>

<DIV CLASS=refsect1>
<h2 CLASS=refsect1><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-1">Description</A></h2>

<P CLASS=para>
The <tt CLASS=literal>Button</tt> is the familiar 
labeled button object. It inherits most of its functionality from <tt CLASS=literal>Component</tt>. 
For example, to change the font of the <tt CLASS=literal>Button</tt>, 
you would use <tt CLASS=literal>Component</tt>'s 
<tt CLASS=literal>setFont()</tt> method. The <tt CLASS=literal>Button</tt> 
sends <tt CLASS=literal>java.awt.event.ActionEvent</tt> 
objects to its listeners when it is pressed. 

</DIV>

<DIV CLASS=refsect1>
<h2 CLASS=refsect1><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-2">Class Definition</A></h2>

<DIV CLASS=screen>
<P>
<PRE>
public class java.awt.Button
    extends java.awt.Component {
  
  // Constructors
  public Button();
  public Button (String label);
  
  // Instance Methods
  public void addActionListener (ActionListener l); <img src="gifs/bstar.gif" alt="(New)" border=0>
  public void addNotify();
  public String getActionCommand(); <img src="gifs/bstar.gif" alt="(New)" border=0>
  public String getLabel();
  public void removeActionListener (ActionListener l); <img src="gifs/bstar.gif" alt="(New)" border=0>
  public void setActionCommand (String command); <img src="gifs/bstar.gif" alt="(New)" border=0>
  public synchronized void setLabel (String label);
  
  // Protected Instance Methods
  protected String paramString();
  protected void processActionEvent (ActionEvent e); <img src="gifs/bstar.gif" alt="(New)" border=0>
  protected void processEvent (AWTEvent e); <img src="gifs/bstar.gif" alt="(New)" border=0>
}
</PRE>
</DIV>

</DIV>

<DIV CLASS=refsect1>
<h2 CLASS=refsect1><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-3">Constructors</A></h2>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-3.1">Button</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-3.1.1">public Button()</A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Constructs a <tt CLASS=literal>Button</tt> object with no label. </DL>
</DIV>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-3.1.2">public Button (String label)</A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Parameters<br>
<DD>

<P>
<DL CLASS=variablelist>
<DT CLASS=varlistentry><I CLASS=emphasis>label</I><br>
<DD>

<P CLASS=para>
The text for the label on the button </DL>
<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Constructs a <tt CLASS=literal>Button</tt> object 
with text of <tt CLASS=literal>label</tt>. </DL>
</DIV>

</DIV>

</DIV>

<DIV CLASS=refsect1>
<h2 CLASS=refsect1><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4">Instance Methods</A></h2>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.1">addActionListener</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.1.1">public void addActionListener (ActionListener l) <img src="gifs/bstar.gif" alt="(New)" border=0></A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Parameters<br>
<DD>

<P>
<DL CLASS=variablelist>
<DT CLASS=varlistentry><I CLASS=emphasis>l</I><br>
<DD>

<P CLASS=para>
An object that implements the <tt CLASS=literal>ActionListener</tt> interface. </DL>
<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Add a listener for the action event. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.2">addNotify</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.2.1">public void addNotify()</A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Overrides <br>
<DD>

<P CLASS=para>
<tt CLASS=literal>Component.addNotify()</tt> 

<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Creates <tt CLASS=literal>Button</tt>'s peer. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.3">getActionCommand</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.3.1">public String getActionCommand() <img src="gifs/bstar.gif" alt="(New)" border=0></A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Returns<br>
<DD>

<P CLASS=para>
Current action command string. 

<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Returns the string used for the action command. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.4">getLabel</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.4.1">public String getLabel()</A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Returns<br>
<DD>

<P CLASS=para>
Text of the <tt CLASS=literal>Button</tt>'s label. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.5">removeActionListener</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.5.1">public void removeActionListener (ActionListener l) <img src="gifs/bstar.gif" alt="(New)" border=0></A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Parameters<br>
<DD>

<P>
<DL CLASS=variablelist>
<DT CLASS=varlistentry><I CLASS=emphasis>l</I><br>
<DD>

<P CLASS=para>
One of this <tt CLASS=literal>Button</tt>'s <tt CLASS=literal>ActionListener</tt>s. </DL>
<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Remove an action event listener. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.6">setActionCommand</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.6.1">public void setActionCommand (String command) <img src="gifs/bstar.gif" alt="(New)" border=0></A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Parameters<br>
<DD>

<P>
<DL CLASS=variablelist>
<DT CLASS=varlistentry><I CLASS=emphasis>command</I><br>
<DD>

<P CLASS=para>
New action command string. </DL>
<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Specify the string used for the action command. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.7">setLabel</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-4.7.1">public synchronized void setLabel (String label)</A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Parameters<br>
<DD>

<P>
<DL CLASS=variablelist>
<DT CLASS=varlistentry><I CLASS=emphasis>label</I><br>
<DD>

<P CLASS=para>
New text for label of <tt CLASS=literal>Button</tt>. </DL>
<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Changes the <tt CLASS=literal>Button</tt>'s 
label to <tt CLASS=literal>label</tt>. </DL>
</DIV>

</DIV>

</DIV>

<DIV CLASS=refsect1>
<h2 CLASS=refsect1><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-5">Protected Instance Methods</A></h2>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-5.1">paramString</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-5.1.1">protected String paramString()</A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Returns<br>
<DD>

<P CLASS=para>
String with current settings of <tt CLASS=literal>Button</tt>. 

<p>
<DT CLASS=varlistentry>Overrides<br>
<DD>

<P CLASS=para>
<tt CLASS=literal>Component.paramString()</tt> 

<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Helper method for <tt CLASS=literal>toString()</tt> 
used to generate a string of current settings. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-5.2">processActionEvent</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-5.2.1">protected void processActionEvent (ActionEvent e) <img src="gifs/bstar.gif" alt="(New)" border=0></A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Parameters<br>
<DD>

<P>
<DL CLASS=variablelist>
<DT CLASS=varlistentry><I CLASS=emphasis>e</I><br>
<DD>

<P CLASS=para>
The action event to process. </DL>
<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Action events are passed to this method for processing. Normally, this 
method is called by <tt CLASS=literal>processEvent()</tt>. </DL>
</DIV>

</DIV>

<DIV CLASS=refsect2>
<h3 CLASS=refsect2><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-5.3">processEvent</A></h3>

<DIV CLASS=refsect3>
<h4 CLASS=refsect3><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-5.3.1">protected void processEvent (AWTEvent e) <img src="gifs/bstar.gif" alt="(New)" border=0></A></h4>

<DL CLASS=variablelist>
<DT CLASS=varlistentry>Parameters<br>
<DD>

<P>
<DL CLASS=variablelist>
<DT CLASS=varlistentry><I CLASS=emphasis>e</I><br>
<DD>

<P CLASS=para>
The event to process. </DL>
<p>
<DT CLASS=varlistentry>Description<br>
<DD>

<P CLASS=para>
Low level <tt CLASS=literal>AWTEvent</tt>s are passed 
to this method for processing. </DL>
</DIV>

</DIV>

</DIV>

<DIV CLASS=refsect1>
<h2 CLASS=refsect1><A CLASS="TITLE" NAME="JAWT-CH-19-REF-BUTTON-SECT-6">See Also</A></h2>

<P CLASS=para>
<tt CLASS=literal>ActionListener</tt>, <tt CLASS=literal>Component</tt>, 
<tt CLASS=literal>String</tt> 

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